Linux 'devel' kernel 2.5.1-pre4

pre4:


- Jens Axboe: fix up bio highmem breakage, more cleanups


- Greg KH: USB update

pre3:


- Al Viro: more superblock cleanups


- Jens Axboe: more patches for new block IO layer


- Christoph Hellwig: get rid of the old, long- deprecated SCSI error handling

pre2:


- Greg KH: USB update


- Richard Gooch: refcounting for devfs


- Jens Axboe: start of new block IO layer

pre1:


- me: README references to 2.4.x -> 2.5.x


- Alexander Viro: fix unmount inode breakage, show_vfsmnt cleanup


- Jeff Garzik: fix 8139too initialization